Tuchel is not a fan of sexy football and he is not a coach who can match with Barcelona's tradition. Barcelona are favorite to choose coaches from Spain or Netherlands because their success last two decades comes from foundation of a Dutch man, Johan Cruyff. After Cruyff, there are some coaches from Netherlands work for Barcelona like Frank Rijkaard, Ronaldo Koeman. After success with Pep Guardiola, they succeeded with another Spanish coach Enrique who is working for PSG in this season.
If Barcelona want to hire a German coach, they can consider Klopp but will have to wait one more season because Klopp announced that he will take 1-year off after this season. He can aim at a coach position of Germany national team because the contract of Nagelsman lasts only till the end of Euro 2024.
I see that the Barcelona team's game is more identical to coaches from Spain or the Netherlands and Barcelona has been doing this for a very long time, so if now they are trying to target a coach from Germany, there is nothing wrong with that, but with the problems that have befallen Barcelona, I think it is a little difficult for the coach. Either way can improve the team's performance and I think coaches who have good capacity are also reluctant to go to Barcelona because the team's condition is not good.
Tuchel is currently still quite successful at Bayern and I don't think Tuchel is willing to manage a Barcelona team.